Travis build: 1079

README.md

@@ -115,6 +115,7 @@ average(1, 2, 3);
 * [`maxN`](#maxn)
 * [`minN`](#minn)
 * [`nthElement`](#nthelement)
+* [`partition`](#partition)
 * [`pick`](#pick)
 * [`pull`](#pull)
 * [`pullAtIndex`](#pullatindex)
@@ -1197,6 +1198,37 @@ nthElement(['a', 'b', 'b'], -3); // 'a'
 <br>[⬆ Back to top](#table-of-contents)
 
 
+### partition
+
+Groups the elements into two arrays, depending on the provided function's truthiness for each element.
+
+Use `Array.reduce()` to create an array of two arrays.
+Use `Array.push()` to add elements for which `fn` returns `true` to the first array and elements for which `fn` returns `false` to the second one.
+
+```js
+const partition = (arr, fn) =>
+  arr.reduce(
+    (acc, val, i, arr) => {
+      acc[fn(val, i, arr) ? 0 : 1].push(val);
+      return acc;
+    },
+    [[], []]
+  );
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+var users = [{ user: 'barney', age: 36, active: false }, { user: 'fred', age: 40, active: true }];
+partition(users, o => o.active); // [[{ 'user': 'fred',    'age': 40, 'active': true }],[{ 'user': 'barney',  'age': 36, 'active': false }]]
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
 ### pick
 
 Picks the key-value pairs corresponding to the given keys from an object.

snippets/partition.md

@@ -7,13 +7,16 @@ Use `Array.push()` to add elements for which `fn` returns `true` to the first ar
 
 ```js
 const partition = (arr, fn) =>
-  arr.reduce((acc, val, i, arr) => {acc[fn(val,i,arr) ? 0 :1].push(val); return acc;},[[],[]]);
+  arr.reduce(
+    (acc, val, i, arr) => {
+      acc[fn(val, i, arr) ? 0 : 1].push(val);
+      return acc;
+    },
+    [[], []]
+  );
 ```
 
 ```js
-var users = [
-  { 'user': 'barney',  'age': 36, 'active': false },
-  { 'user': 'fred',    'age': 40, 'active': true }
-];
-partition(users, o => o.active) // [[{ 'user': 'fred',    'age': 40, 'active': true }],[{ 'user': 'barney',  'age': 36, 'active': false }]]
+var users = [{ user: 'barney', age: 36, active: false }, { user: 'fred', age: 40, active: true }];
+partition(users, o => o.active); // [[{ 'user': 'fred',    'age': 40, 'active': true }],[{ 'user': 'barney',  'age': 36, 'active': false }]]
 ```